Here is the full list of all 38 Ziggurat achievements.
Die 50 times
Unlock all weapons,perks,lore & character classes
Unlock all perks
Die 25 times
Die 10 times
You died on a danger room
Win a game on hard difficulty
Unlock all magic weapons
Win a game with every character (any difficulty)
Unlock all character classes
Died after killing the boss
Unlock all amulets
Reach floor 2 without getting damaged
Get to floor 3 using only the magic wand (Apprentice class only)
Kill all enemies at least once (including bosses)
Win the game without using any level up
Unlock all enemies in the bestiary
Win the game with Argo on Normal difficulty in less than 45 minutes
Find all lore scrolls
Kill 5000 enemies
Break 2,000 things (Barrels, tombs...)
Kill 500 enemies affected with elemental states
Kill a Lost soul with the Skull of Xanatos
Find a super secret cheat code
Survive the Ziggurat
Kill 1000 enemies
You met your match in the final showdown
Find your first amulet
Master a perk by getting it to level 5
You've been ambushed in a treasure room
Reach experience level 15
Reach experience level 10
Equip a weapon of every kind
You reached 3rd floor. Now the real lesson begins.
Complete a challenge room
Reach experience level 5
Find a secret room
Get your first level up